What is R32 refrigerant and why should I be careful with it?

The Della Mini Split AC is pre-charged with R32 refrigerant, which should be treated with care as it may cause frostbite, cardiac arrhythmia, and/or irritation, as well as cause environmental damage. The charge amount of refrigerant should strictly follow the manufacturer's specifications, local codes, and safety requirements based on your room size. (Page 4, 5)